CN101553943A - Sealant integrated fuel cell components and methods and systems for producing the same - Google Patents

Sealant integrated fuel cell components and methods and systems for producing the same Download PDF

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Publication number
CN101553943A
CN101553943A CNA2007800075311A CN200780007531A CN101553943A CN 101553943 A CN101553943 A CN 101553943A CN A2007800075311 A CNA2007800075311 A CN A2007800075311A CN 200780007531 A CN200780007531 A CN 200780007531A CN 101553943 A CN101553943 A CN 101553943A
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China
Prior art keywords
fuel cell
die cavity
sealant
electrode assembly
membrane electrode
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CNA2007800075311A
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Chinese (zh)
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CN101553943B (en
Inventor
M·P·布尔齐
B·R·艾因斯拉
K·J·韦尔奇
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Dial Corp
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Henkel Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/028—Sealing means characterised by their material
    • H01M8/0284—Organic resins; Organic polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0286—Processes for forming seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • H01M8/242—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes comprising framed electrodes or intermediary frame-like gaskets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M2008/1095—Fuel cells with polymeric electrolytes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

A fuel cell, having improved sealing against leakage, includes a sealant disposed over the peripheral portions a membrane electrode assembly such that the cured sealant penetrates a gas diffusion layer of the membrane electrode assembly. The sealant is applied through liquid injection molding techniques to form cured sealant composition at the peripheral potions of the membrane electrode assembly. The sealant may be thermally cured at low temperatures, for example 130 DEG C or less, or may be cured at room temperature through the application of actinic radiation.

Description

Sealant integrated fuel cell components and production its method and system
Technical field
[0001] the present invention relates to bonding and sealed electrochemical cell, the method and composition of each assembly in the fuel cell for example, and by its electrochemical cell that forms.More particularly, the present invention relates to use fluid sealant, composition, method and the design of the incorporate mold seal members of preparation on the membrane electrode assembly of fuel cell.
Background technology
[0002] although there are all kinds of known electrochemical cells, a kind of common type is a fuel cell, for example proton exchange membrane (" PEM ") fuel cell.The membrane electrode assembly (" MEA ") that provides between two flow-field plate or bipolar plate is provided the PEM fuel cell.Between bipolar plate and MEA, use packing ring, to be provided at sealing therebetween.In addition, because independent PEM fuel cell typically provides low relatively voltage or power, a plurality of PEM fuel cells that therefore superpose are to increase the total electricity output of gained fuel cell module.Between single PEM fuel cell, also require sealing.In addition, typically also provide coldplate, with the temperature in the control fuel cell.This plate of same sealing is to prevent in the fuel cell module internal leakage.After assembling, fastening this fuel cell layered body is to fix this assembly.
[0003] described in U.S. Patent No. 6057054, liquid silastic has been proposed for molding on membrane electrode assembly.Yet this silicon-ketone composition can degraded before the life-span in the action required that realizes fuel cell.This silicone rubbers release materials is the pollution feul battery also, thus the negative effect fuel cell performance.In U.S. Patent No. 5264299, also disclose at dividing plate (separator plate) and gone up the molding liquid silastic.In order to increase its operation lifetime, more durable elastomer has been proposed, disclosed polyolefin hydro carbons in disclosed fluoroelastomer and the U.S. Patent No. 6159628 in the U.S. Patent No. 6165634 for example, the surface of each assembly of bonding fuel cell.Yet these compositions do not flood loose structure, for example gas diffusion layers.Under the situation of not damaging base material or dipping loose structure, the viscosity of these thermoplasticity and fluoroelastomer composition is high too for injection moulding.
[0004] U.S. Patent Application Publication No.US 2005/0263246A1 discloses the method for preparing edge seal on membrane electrode assembly, and this method uses fusing point or glass transition temperature to be about 100 ℃ thermoplastic film, impregnating gas body diffused layer.This method existing problems are because proton exchange membrane may be exposed to the processing temperature that maximum temperature under it will limit melt.Seal is with the operating temperature upper limit of fuel cell then.For example, proton exchange membrane typically can only be exposed under 130 ℃ the maximum temperature, and it is operated under at least 90 ℃ temperature usually.Therefore, the normal and maximum operating temp of fuel cell is subjected to the adhesive method restriction of this disclosure.
[0005] U.S. Patent No. 6884537 discloses the purposes that the rubber washer with gasket seal (heads) is used for seal fuel cell components.By using adhesive layer, fix this packing ring to fuel cell component, move or slide to prevent packing ring.Similarly, international patent publications Nos.WO2004/061338A1 and WO2004/079839A2 disclose the purposes of multi-disc and monolithic washer sealing fuel cell component.By using adhesive, described packing ring is fixed on the fuel cell component.The location of adhesive and packing ring is not only consuming time, and problem is arranged, and leaks and performance loss because misalignment may cause fuel cell.
[0006] U.S. Patent No. 6875534 discloses the periphery of original place cured compositions sealed fuel battery dividing plate.The original place cured compositions is included in the polyisobutene polymer that each end group place has the pi-allyl end group, and organopolysiloxane has at least two hydrogen atoms and is connected to organic group hydrogen polysiloxanes and platinum catalyst on the silicon atom separately.U.S. Patent No. 6451468 discloses dividing plate, electrode or the amberplex in the composition sealed fuel battery that the original place forms.The composition that the original place forms is included in the straight chain polyisobutene PFPE that each end group place has the alkenyl end group, and have at least two hydrogen atoms and be bonded to crosslinking agent or curing agent on the silicon atom separately, and hydrosilylation catalysts.Because of using pi-allyl or alkenyl functionality is 2 straight chain polyisobutylene oligomer, causes the crosslink density of these compositions and gained performance to be limited to.By changing hydrogenation silyl functional degree, come the degree of functionality in these compositions of modification, this will limit the performance of resulting composition.
[0007] the open foam rubber packing ring of international patent publications No.WO2004/047212A2, liquid silicones sealant or solid fluoroplastics are used for the fluid transport layer of sealed fuel battery or the purposes of gas diffusion layers.Use solid gasket, promptly foam rubber and/or solid fluoroplastics adhesive tape or film make these materials of location and subsequently calibrated fuel battery component and packing ring consuming time be a problem.
[0008] U.S. Patent Application Publication No.2003/0054225 discloses slewing, and for example rotary drum or roller are used to apply the purposes of electrode material to the fuel cell electrode.Although this publication document discloses the automatic mode that forms fuel cell electrode, this publication document does not solve the problem of this care of sealing of formed fuel cell.
[0009] although there are these prior aries, but still need be suitable for using with electrochemical cell components, be the encapsulant composition that applies by liquid injection molding requiredly.
Summary of the invention
[0010] in single cell arrangements, on each anode and cathode side, provides fluid-flow field plates.This plate serves as current-collector, and the electrode support is provided, the passage that provides fuel and oxidant to pass in and out each anode and cathode surface, and the passage of removing the water that forms in battery-operated process is provided in some fuel cell design.In many cell arrangements, stacked each parts provide the fuel battery with a plurality of independent fuel cells.Can connect usually, but connect two or more fuel cells in parallel together sometimes, increase the total power output of assembly.In series arrangement, a side of given plate is served as the positive plate of a battery and the opposite side of this plate can serve as the minus plate of adjacent cell.This multiple fuel cell layout that is connected in series is called as fuel cell layered body, and keeps together by pull bar and end plate with its assembled state usually.This duplexer typically comprise manifold and arrival end for pilot fuel and oxidant in the flow field channel of anode and negative electrode.
[0011] center part of fuel cell is membrane electrode assembly (MEA), and described MEA comprises two electrodes (anode, negative electrode) that place between gas diffusion layers (" GDL ") and the ionic conduction polymer electrolyte.Each electrode layer comprises electrochemical catalyst, for example platinum, palladium, ruthenium and/or nickel.GDL places on the electrode, to promote gas transmission turnover electrode material and conduction current.When being supplied with fuel (hydrogen) and oxidant (oxygen), two electrochemical half-cell reactions take place.The hydrogen that is fed into anode is oxidized, produces proton and electronics in the presence of catalyst.The gained proton transmits in aqueous environment crosses electrolyte arrival negative electrode.Useful electric energy is allowed them to arrive negative electrode by the electronics utilization of moving by external circuit afterwards.At the negative electrode place, be reduced and combine with proton and electronics from airborne gaseous oxygen.Total cell reaction obtains 1 mole of water per mole of hydrogen and 0.5 mole of oxygen.
[0012] when assembling fuel cell,, typically suppresses membrane electrode assembly between bipolar plate or the one pole plate at dividing plate.This plate is mixed with the flow channel of reactant gas and also can contains heat transfer tube.Therefore, the invention provides the method for sealing hydrated reactant gases in battery.The first step of this method is included in compression moulding fluid sealant on the membrane electrode assembly edge.Required ground, non-conducting sealant penetration gas diffusion layers prevents electrical short in fuel cell.The result of moulding technology provides the membrane electrode assembly with edge sealing that can easily dispose.In case be provided, the membrane electrode assembly of molding can be united placement with dividing plate, and element cell is provided.Fuel cell layered body typically is made up of a plurality of element cells.
[0013] according to an aspect of the present invention, can in liquid injection molding technology, use single part of heat-setting hydrocarbon sealant.The sealing agent has pumpable viscosity under its uncured state, make it have the shape of mould.Sealant can comprise the hydrocarbon of allyl capped, reactive diluent, organic group silyl hydride, inhibitor and catalyst.Reactive diluent can be simple function, difunctionality, trifunctional or multifunctional diluent, so that the crosslink density of the seal that influence is solidified.The suitable amounts of selecting catalyst and inhibitor is solidified the sealing agent at elevated temperatures.Typical curing temperature scope is 50 ℃-200 ℃.Select curing temperature, with the curing sealant fully of mode timely, so that it is compatible with film requiredly.For example, typical perfluorinated sulfonic acid PEM can not be in heating more than 130 ℃.In moulding technology of the present invention, with film in electrode and GDL insert the mould of injection molding machine and the matched moulds closure.Under suitable temperature, be injected in heated mold or the die head single part of hydrocarbon sealant and curing, the sealing of MEA edge is provided.
[0014] with other typical sealing and gasket materials, for example silicone, ethylene propylene diene monomer (" EPDM ") rubber are compared with fluoroelastomer, and this hydrocarbon sealant material provides several advantages.Silicone is typically not long following stabilization time at the aggressivity acidity and the heat condition of fuel cell, and does not provide organic pollutants necessary sensitivity.EPDM rubber does not provide the dipping necessary to gas diffusion layers, to prevent in case in fuel cell when assembling electrical short.The common cost of fluoroelastomer is high and need solidify more than the degradation temperature of proton exchange membrane.
[0015] compare with other sealant structures, the MEA design of molding of the present invention provides several advantages.By direct injection moulding sealant on 5 layer MEAs, the edge sealing is provided, prevent that reactant gas from leaking out MEA.The seal that solidifies provides maintenance MEA parts (PEM, electrode, GDL) method together subsequently.In the Shooting Technique process, sealant dipping GDL.This will improve the adhesiveness of sealant to MEA, and prevent that GDL from touching (touching), and this touching will cause short circuit.One step sealing technology will reduce built-up time and the seal quantity in fuel cell layered body.
[0016] in one aspect of the invention, can use the gas diffusion layers of liquid injection molding sealant impregnated membranes electrode assemblie, and polymerization, produce seal along the edge of membrane electrode assembly, so that membrane electrode assembly can be operated applying under the temperature more than the temperature of sealant.The normal running temperature of proton exchange membrane (PEM) fuel cell is about 90 ℃.The ceiling temperature of typical membrane electrode assembly (MEA) is about 130 ℃.Therefore, it has been generally acknowledged that the known thermoplastic sealants of processing in 90 ℃ to 130 ℃ temperature range.Thermoplastic sealants is not taken in fusion below 90 ℃, and this is that it will flow when operation of fuel cells because in other cases.In addition, in order to obtain manufacturing time fast, the processing temperature of thermoplastic can not be increased to more than 130 ℃, and this is because MEA will degrade.In one aspect of the invention, it is favourable using thermosetting encapsulants.Thermosetting encapsulants can flow into the parts of mould and/or MEA at low temperatures, be in the GDL, and be to solidify under 90 ℃ to 130 ℃ the temperature in scope, provide not only stable under the fuel battery operation temperature, and under temperature far above normal running temperature stable cross-linked material.Useful composition can comprise sense hydrocarbon and functionality fluoropolymer.
[0017] in another aspect of this invention in, in liquid injection molding technology, use curable hydrocarbon sealant.The sealing agent can comprise sense hydrocarbon, reactive diluent, organic group silyl hydride, inhibitor and catalyst.The consumption of required ground selecting catalyst and inhibitor in the short time period, for example is being less than or equal to curing sealant in about 15 minutes under about 130 ℃ or following temperature.In moulding technology, can under suitable temperature, sealant be injected directly on the membrane electrode assembly by mould or die head, and solidify, the sealing of membrane electrode assembly edge is provided.
[0018] in another aspect of this invention in, polymer composition is injected in mould or the die head described mould or die head transmission or see through specific electromagnetic radiation, for example ultraviolet light.By die head injection said composition and be exposed under the electromagnetic radiation of setted wavelength, and polymerization, seal formed.
[0019] in another aspect of this invention in, can with b rank composition melt impregnation in the membrane electrode assembly and polymerization, provide the sense seal.
[0020] in one aspect of the invention, the method for formation fuel cell comprises provides the membrane electrode assembly that contains gas diffusion layers; Mould with die cavity is provided; Jig is so that die cavity is communicated with the membrane electrode assembly fluid; Apply curable fluid sealant composition in die cavity; With the curing said composition.The step that applies sealant can further comprise and applying pressure on the sealant, so that sealant penetration gas diffusion layers and/or apply sealant, so that the sealed dose of step that covers fully in membrane electrode assembly edge.The step of hardening composition can further be included in and be less than or equal under about 130 ℃ temperature, being less than or equal under 100 ℃ the temperature, is being less than or equal to thermal cure sealants under about 90 ℃ temperature requiredly more requiredly.Useful heat-setting encapsulant composition comprises the hydrocarbon oligomer of alkenyl end-blocking; Polyfunctional alkenyl monomer; Have silicyl curing agent and hydrosilylation catalysts at least about two silicon hydride functional.Required ground, the hydrocarbon oligomer of alkenyl end-blocking comprises the polyisobutylene oligomer of alkenyl end-blocking.
[0021] step of hardening composition also can be included in curing sealant under about room temperature.This step can be included in the step that the actinic radiation curing sealant is provided under about room temperature.Required ground, curable encapsulant composition comprises the material of actinic radiation curable, described material is selected from acrylate, carbamate, polyethers, polyolefin, polyester, its copolymer and bond thereof.
[0022] in another aspect of this invention in, the system that forms fuel cell comprises first and second mold components with relative match surface, wherein at least one match surface have the die cavity of washer-shaped and the port that is communicated with this die cavity fluid and wherein at least one mold component transmission pass wherein actinic radiation; And actinic radiation sources, wherein when relative match surface is arranged with the relation of adjoining basically, by the actinic radiation transmissive die cavity of its generation.Required ground, fuel cell component can be by fixedly placing between first and second mold components, and wherein die cavity is communicated with the fuel cell component fluid.Perhaps, one of mold component can be a fuel cell component, membrane electrode assembly for example, and wherein the packing ring that solidifies of original place can form on described assembly, so that an integral gasket thereon to be provided.
[0023] in another aspect of this invention in, the system that forms fuel cell comprises first and second mold components with relative match surface, wherein at least one match surface has the die cavity of washer-shaped and the port that is communicated with this die cavity fluid, wherein at least one mold component can heat, when arranging with the relation of adjoining basically with the relative match surface of box lunch, this die cavity of heat energy transmissive.Required ground, fuel cell component can be by fixedly placing between first and second mold components, and wherein die cavity is communicated with the fuel cell component fluid.Perhaps, one of mold component can be a fuel cell component, membrane electrode assembly for example, and wherein the packing ring that solidifies of original place can form on described assembly, so that an integral gasket thereon to be provided.
[0024] in another aspect of this invention in, the membrane electrode assembly that provides encapsulant composition to place assembly peripheral part with curing, wherein the encapsulant composition of this curing comprises the diallyl polyisobutylene oligomer of alkenyl end-blocking; Have silicyl curing agent, wherein be bonded on the silicon atom about only a hydrogen atom at least about two silicon hydride functional; And hydrosilylation catalysts.Cured compositions can further comprise the polyfunctional group alkenyl monomer.
[0025] in another aspect of this invention in, provide encapsulant composition to place the membrane electrode assembly of assembly peripheral part with curing, wherein the encapsulant composition of this curing comprises the actinic radiation curable material, described material is selected from acrylate, carbamate, polyethers, polyolefin, polyester, its copolymer and bond thereof.
Description of drawings
[0026] Fig. 1 is the cross sectional view with fuel cell of anode flow field board, gas diffusion layers, anode catalyst, proton exchange membrane, cathod catalyst, second gas diffusion layers and cathode flow field plate.
[0027] Fig. 2 is the cross sectional view of having arranged the membrane-membrane electrode for fuel cell assembly of sealant at peripheral part of assembly.
[0028] Fig. 3 is the cross sectional view of having arranged the membrane-membrane electrode for fuel cell assembly of sealant in peripheral part of assembly and marginal portion on every side.
[0029] Fig. 4 has arranged sealant so that form the cross sectional view of the fuel cell of stacked fuel cell module between the flow-field plate of membrane electrode assembly and fuel cell.
[0030] Fig. 5 is the perspective view of the mould with top and bottom mold member used of packing ring formed according to the present invention.
[0031] Fig. 6 is the cross sectional view of the mould of Fig. 5 of obtaining along the 6-6 axle.
[0032] Fig. 7 is the exploded view of mould of describing Fig. 6 of top mold member and bottom mold member.
[0033] Fig. 8 is the bottom view of the top mold member of Fig. 7 of obtaining along the 8-8 axle.
[0034] Fig. 9 is the left view of the top mold member of Fig. 8 of obtaining along the 9-9 axle.
[0035] Figure 10 is the right view of the top mold member of Fig. 8 of obtaining along the 10-10 axle.
[0036] Figure 11 is the cross sectional view of the top mold member of Fig. 8 of obtaining along the 11-11 axle.
[0037] Figure 12 is the perspective view according to alternative mould of the present invention.
[0038] Figure 13 A and 13B are the cross sectional view of the mould of Figure 12 of obtaining along the 13-13 axle, and it shows the fuel cell component of arranging in mould.
[0039] Figure 14 is the perspective view of the top mold member of Fig. 5 or 12, and it has described the top mold member with transparent material.
[0040] Figure 15 is the cross sectional view of the transparent top mold member of Figure 14 of obtaining along the 15-15 axle.
Embodiment
[0041] the present invention relates to the to bond adhesive method and the composition of each parts in the electrochemical cell.Electrochemical cell as used herein is the device that is produced electricity by chemical source, and described chemical source includes, but not limited to chemical reaction and chemical combustion.Useful electrochemical cell comprises fuel cell, dry cell, wet cell and analog.Below the fuel cell that will describe in further detail is by the chemical reaction deposits yields.Wet cell has liquid electrolyte.Dry cell has the electrolyte that is adsorbed on porous media or is limited in other cases to flow.
[0030] Fig. 1 shows electrochemical fuel cell, for example the cross sectional view of each primary element in the fuel cell 10.Electrochemical fuel cell transforms fuel and becomes electricity and product with oxidant.Fuel cell 10 is by at the coolant channel 14 that has open surface on the side with have the anode flow field board 12 of anode fluid passage 16 on second side, resin plate 13, gas diffusion layers 18, anode catalyst 20, proton exchange membrane 22, cathod catalyst 24, the second gas diffusion layers 26, second resin plate 13 and form at coolant channel 30 that has open surface on the side and the cathode flow field plate 28 that on second side, has a cathode fluid passage 32, as shown in Figure 1.Gas diffusion layers 18, anode catalyst 20, proton exchange membrane 22, the combination of the cathod catalyst 24 and second gas diffusion layers 26 usually is called as membrane electrode assembly 36. Gas diffusion layers 18 and 26 is typically by porous, conductive sheet, and for example carbon fiber paper forms.Yet, the invention is not restricted to use carbon fiber paper and can use other materials suitably.Yet fuel cell is not limited to the component layouts of this description.Anode and cathode catalyst layer 20 and 24 typically are the platinum form of fine pulverizing.Anode 34 and negative electrode 38 are electrically connected (not shown), to be provided at the path on the conduction electron arrival external loading (not shown) between the electrode.Flow-field plate 12 and 28 is typically by the plastics of graphite impregnation; The graphite of compacting and layering; Porous graphite; Stainless steel or other graphite composite materials form.Can handle this plate, to influence surface property, for example surface wettability perhaps can be untreated.Yet, the invention is not restricted to use this material as flow-field plate with can use other materials suitably.For example, in some fuel cells, flow-field plate typically, is made but be not limited to stainless steel by metal or metallic material.Flow-field plate can be a bipolar plate, promptly has the plate of fluid passage on relative plate surface, as shown in Figure 1.Perhaps, can be by fixing one pole plate together, preparation bipolar plate.
[0043] some fuel cell design utilizations improve at the resinous framework 13 between membrane electrode assembly 36 and the dividing plate 12,28 in the durability and the assembling process at fuel cell of membrane electrode assembly 36, provide appropriate interval between membrane electrode assembly 36 and dividing plate 12,28.In this design, need between dividing plate 12,28 and resinous framework 13, have sealing.
[0044] the invention is not restricted to fuel cell component shown in Figure 1 and layout thereof.For example, directly methanol fuel cell (" DMFC ") can be made up of the less parts same as shown in Figure 1 of coolant channel.In addition, fuel cell 10 can design and have inside or external manifold (not shown).
[0045] although described the present invention, should be appreciated that the present invention can be applicable on the fuel cell of any kind at proton exchange membrane (PEM) fuel cell.Notion of the present invention may be used on phosphoric acid fuel cell, alkaline fuel cell, high-temperature fuel cell, for example on Solid Oxide Fuel Cell and molten carbonate fuel cell and other electrochemical appliances.
[0046] at anode 34 places, the fuel (not shown) infiltration gas diffusion layer 18 of advancing through anode fluid passage 16 and in the reaction of anode catalyst layer 20 places forms hydrogen cation (proton), and described hydrogen cation migration arrives negative electrodes 38 through proton exchange membrane 22.Proton exchange membrane 22 acceleration hydrogen ions are moved to negative electrode 38 from anode 34.Except the conduction hydrogen ion, proton exchange membrane 22 is separated hydrogeneous fuel stream from oxygen containing oxidant stream.
[0047] at negative electrode 38 places, oxygen-containing gas, for example air or pure basically oxygen and the cation of crossing proton exchange membrane 22 or hydrogen ion reaction form liquid water as product.Following equation shows anode and the cathode reaction in the hydrogen/oxygen fuel cell:
Anode reaction: H 2→ 2H ++ 2e -(I)
Cathode reaction: 1/2O 2+ 2H ++ 2e -→ H 2O (II)
[0048] Fig. 2 has described at peripheral part 33 places of membrane electrode assembly 36 or has had near it and solidified or the membrane electrode assembly 36 of curable composition 40.As described below, said composition 40 can be used for sealing and/or fuel cell bonded to one another in different parts.
[0049] yet, the invention is not restricted to make the parts of fuel cell, for example or membrane electrode assembly 36 near peripheral part 33 places of membrane electrode assembly 36 or its, have composition 40.For example, as shown in Figure 3, curable or curable composition 40 can place peripheral part 33 places or near its surrounding edge part 35 and coverlay electrode assemblie 36 of membrane electrode assembly 36.
[0050] Fig. 4 shows the cross sectional view of primary element in the fuel cell 10, the element that some of them are adjacent have betwixt curing or curable composition 40, so that fuel stack 10` to be provided.As described in Figure 4, composition 40 sealings and/or bonding anode flow field board 12 are on gas diffusion layers 18 or membrane electrode assembly 36.Cathode field plate 28 also seals and/or is bonded on gas diffusion layers 26 or the membrane electrode assembly 36.In this embodiment, fuel battery 10` usually has anode catalyst 20 and cathod catalyst 24 preformed membrane electrode assembly 36 anodes placed on it.Place the composition 40 between each parts of fuel battery 10` can be identical composition or can be different compositions.In addition, as described in Figure 4, the parts of salable and/or bonding cathode flow field plate 28 to second fuel cells of composition 40 are for example on the second plate flow-field plate 12`.In addition, as described in Figure 4, the salable and/or bonding second plate flow-field plate 12` of composition 40 is to the parts of second fuel cell, for example on the second membrane electrode assembly 36`.In such a way, fuel battery 10` is made up of a plurality of fuel cells, and described a plurality of fuel cells have the parts that connect by sealing and/or adhesive, so that the electrochemical appliance of a plurality of batteries to be provided.
[0051] Fig. 5 is according to the present invention, can be used for forming the perspective view of the mould 48 of the packing ring that solidifies in the original place.Mould 48 comprises upper mold member 50, lower mold member 36` and sprue 52, as shown in.In this embodiment, composition 40 places on the lower mold member 36`, forms packing ring betwixt or on it.In this embodiment of the present invention, lower mold member 36` is a fuel cell component requiredly, and for example membrane electrode assembly 36.Yet the invention is not restricted to use membrane electrode assembly 36 can be bottom mould part as bottom mould part and other fuel cell components.As shown in Figure 8, sprue 52 is communicated with die cavity 54 fluids.
[0052] Fig. 6 is the cross sectional view of the mould 48 of Fig. 5 of obtaining along the 6-6 axle.As shown in Figure 6, upper mold member 50 comprises die cavity 54.The composition that forms liquid gasket can be incorporated in the die cavity 54 by sprue 52.
[0053] Fig. 7 is part separation (partial-break-away) view of the mould 48 of Fig. 6.Mold component 50 comprises that match surface 56 and mold component 36` comprise match surface 58. Adjustable mold component 50 and 36` be to going up each other, as shown in Figure 6, so that match surface 56 and 58 is arranged side by side each other basically.As shown in Figure 7, from die cavity 54, take out packing ring 40 and being fixed on the match surface 58.
[0054] as shown in Figure 8, die cavity 54 is the shape of peripheral airtight design.Although die cavity 54 is described to round rectangle in Fig. 8, the invention is not restricted to this and can use the die cavity of other shapes suitably.In addition, although the cross sectional shape of die cavity 54 is described to rectangle or square in Fig. 7, the invention is not restricted to this and can use other cross sectional shapes suitably, for example circular, oval or moulding geometry with extension is in order to improve sealing.
[0055] as shown in Figure 8, mould 50 can contain second port 60.Second port 60 is communicated with die cavity 54 fluids.When forming the material loading mould cavity, can use second port 60 to make die cavity 54 degassings with packing ring.When packing ring formation material was incorporated in the die cavity 54 by sprue 52, air can be overflowed through second port 60, make die cavity 54 degassings.Size for the present invention's second port 60 is not limit.Required ground minimizes the size of second port 60, and promptly the cross section prolongs, and so that air outlet slit to be provided, but enough little liquid stream with restriction packing ring formation material flows through.In other words, the size of second port 60 can be an aperture size, and wherein air can flow through wherein, suppresses liquid gasket formation material simultaneously and flows in a large number.In addition, the invention is not restricted to use single sprue 52 or single-port 60 and can use a plurality of ports to introduce gasket materials and/or discharged air.
[0056] Fig. 9 is the cross sectional view of the mold component 50 that obtains of the 9-9 axle along Fig. 8.As shown in Figure 9, sprue 52 may suitably be die cavity or the inner chamber in the mold component 50.Sprue 52 parts can have the screw thread (not shown) or have packing ring formation material can be through valve (not shown) or the pipeline or the flexible pipe (not shown) of its transmission.
[0057] Figure 10 is the cross sectional view of the mold component 50 that obtains of the 10-10 axle along Fig. 8.As shown in figure 10, port 60 may suitably be die cavity or the inner chamber in the mold component 50.Port 60 parts can have the valve (not shown) and form the material outflow in order to control air and/or packing ring.
[0058] Figure 11 is the cross sectional view of the mold component 50 that obtains of the 11-11 axle along Fig. 8.Die cavity 54 is described as be in its match surface 56 places and extends to mold component 50 inside.
[0059] Figure 12 is according to the present invention, can be used for forming the perspective view of the mould 48`` of the packing ring that solidifies in the original place.Mould 48`` comprises upper mold member 50, lower mold member 70.Shown in Figure 13 A and 13B, mold component 50 and 70 can be fixing together according to above-described mode, and structure, so that fuel cell component, for example membrane electrode assembly 36 can place therebetween.As shown in FIG. 13A, mould 48`` of the present invention is used on peripheral part of opposite side of fuel cell component 36 and forms packing ring 40.Shown in Figure 13 B, also can use mould 48`` of the present invention, forming packing ring 40 on the side on the opposite side of fuel cell component 36 and around.
[0060] Figure 14 is a perspective view of describing mold component 50,70, and mold component 50,70 can be made maybe by transparent material can comprise transparent material.Required ground, mold component 50,70 is transparent, i.e. transmissive or the photochemical radiation of transmissive, for example UV irradiation basically.Figure 15 has described the cross sectional view of transparent mold component 50,70.
[0061] this method on the one hand of the present invention can further be included in before the injection or when the packing ring of injecting fluid, actinic radiation curable forms composition, make the step of the die cavity degassing.Required ground, degassing step comprise second port, 60 degassings by being communicated with die cavity 54 fluids.
[0062] utilize die cavity 54 degassing and above-described fluid properties, fluid composition is loading mould cavity 54 and do not need excessive fluid operated pressure fully.Required ground, under the fluid-operated pressure that is less than or equal to about 690 kPas (100 pounds/square inch (gauge pressures)), fluid composition is loading mould cavity 54 fully.
[0063] after curing or partly solidified at least composition, mold component 50,36` or 50,70 can peel off each other, to expose packing ring, can take out packing ring 40 afterwards from die cavity 54.Fuel cell component is arranged requiredly and/or be fixed to packing ring 40, for example on the membrane electrode assembly 36.
[0064] although with the formal description of top mold member 50,70 with groove or die cavity 54 the present invention, the invention is not restricted to this.For example, in order to substitute the die cavity 54 or in addition in the top mold member, bottom mold member 36`, 70 and/or fuel cell component, for example film exchange membrane 36 can have groove or die cavity for placing and form seal.
[0065] requiredly, fluid composition of the present invention can be less than or equal to curing in about 5 minutes under room temperature or room temperature left and right sides temperature.More required ground, fluid composition is being less than or equal to curing in 1 minute, for example is being less than or equal to curing in 30 seconds.
[0066] in another aspect of this invention in, can in liquid injection molding technology, use curable sealant.Can stacked dividing plate and resinous framework and in the mould internal calibration.For example with stacked from bottom to top each parts of the order of cathode resin frame, cathode separator, anode clapboard and anode resin frame.These fuel cell components can contain one or more continuous path or hole (gates), allow sealant flow through each parts and each parts that bond, simultaneously at the top, bottom and/or molded seal is provided on the edge.Sealant has pumpable viscosity under its uncured state, allow it to have the shape of molding.Curable sealant is injected in heated mold or the die head bonding and seal fuel cell components under suitable temperature.
[0067] in another aspect of this invention in, in liquid injection molding technology, use curable sealant.Stacked two dividing plates and in the mould internal calibration, so that the coolant pathway side of dividing plate faces with each other.Dividing plate can contain one or more continuous path and allow sealant each parts that bond to provide molded seal at each end and/or edge simultaneously.Sealant has pumpable viscosity under its its uncured state, have the shape of mould to allow it.Curable sealant is injected in heated mold or the die head bonding and seal diaphragm under suitable temperature.Do not exist therein under the situation of continuous path, produce the bipolar plate of edge sealing.
[0068] in another aspect of this invention in, in liquid injection molding technology, use curable sealant.Fuel cell component, the resinous framework that for example can have one or more hole or hole places in mould or the die head.Sealant has pumpable viscosity under its its uncured state, allow it to have the shape of mould.Sealant is injected in heated mold or the die head curing sealant under suitable temperature.Be provided on the both sides and may on the edge, have the resinous framework of integrated sealing.
[0069] the selected parts that can bond in other method bond according to method of the present invention then and seal, and this also is foreseeable.As an example, the assembly of stacked MEA and bonding and calibration in moulding technology.As an example, the assembly of bonding can be made up of resinous framework and dividing plate.The assembly of MEA and bonding can contain one or more continuous path, allows sealant each parts that bond, simultaneously at each end and/or molded seal is provided on the edge.Sealant has pumpable viscosity under its its uncured state, allow it to have the shape of mould.Curable encapsulant is injected in heated mold or the die head bonding and seal diaphragm under suitable temperature.
[0070] in one aspect of the invention, the encapsulant composition of the curing of Shi Yonging comprises the polyisobutylene oligomer of alkenyl end-blocking in the present invention, for example the diallyl polyisobutylene oligomer of alkenyl end-blocking; Randomly polyfunctional alkenyl monomer; Silicyl curing agent or crosslinking agent with at least one hydrogen atom that is bonded on the silicon atom; And hydrosilylation catalysts.Required ground, be bonded to any silicon atom in the silicyl curing agent about only 1 hydrogen atom on.
[0071] composition of the present invention has improved molecular structure, thereby causes the mechanical performance, crosslink density and the reaction heat that improve.Composition available expression (A-A+A of the present invention f+ B f) represent that wherein A-A represents the diallyl polyisobutylene oligomer of alkenyl end-blocking, i.e. alkenyl in the difunctionality alkenyl polyisobutene (" PIB "), A represents alkenyl, B represents that Si-H base and f are meant the quantity of corresponding functional group.
[0072] when alkenyl and hydride all were difunctional, polymerization obtained linear chain structure.Yet, the restricted number of the hydride functionalities in this linear chain structure the total degree of functionality and the crosslink density of reaction network.By introducing more than or equal to 3 alkenyls on single monomer or oligomer, will increase crosslink density and improve mechanical performance.
[0073] poly-(isobutene) oligomer of the straight chain of two useful alkenyl end-blockings can be available commercially from the KanekaCorporation company of Japanese Osaka with EP200A, EP400A and EP600A form.These three kinds of oligomer have identical degree of functionality, but the molecular weight difference.EP200A, EP400A and EP600A have 5000 respectively; 10,000 and 20,000 approximate molecular weight (Mn).
[0074] composition of the present invention also can comprise having at least two reactive hydrogenation functionalized silicon groups, the i.e. siloxanes of at least two Si-H bases.This component is served as the curing agent or the crosslinking agent of the diallyl polyisobutylene oligomer of alkenyl end-blocking.In the presence of hydrosilylation catalysts, in linked with silicon bonded hydrogen atom experience and reactive oligomers in the addition reaction of unsaturated group, this reaction is called as hydrosilylation reactions.Because reactive oligomers contains at least two unsaturated groups, therefore silicone cross-linked component can contain at least two and silicon bonded hydrogen atom requiredly, to realize final cross-linked structure in the cured product.That exist in silicone cross-linked component and the organic group silicon bonding can be selected from the above identical replacement of listing at the reactive siloxane component and the group of unsubstituted univalence hydrocarbyl, exception be that organic group in siloxane crosslinker should be substantially free of ethylenic or acetylene bond formula degree of unsaturation.The molecular structure of siloxane crosslinker can be straight chain, side chain, ring-type or network.
[0075] the silicone linked is optional from wide in range all cpds, meets those of following formula requiredly:
Figure A20078000753100191
R wherein 1, R 2And R 3In at least two be H, otherwise R 1, R 2And R 3Can be identical or different, and can be to replace or unsubstituted C 1-20Alkyl for example comprises the alkyl of alkyl, alkenyl, aryl, alkoxyl, alkenyl oxy, aryloxy group, (methyl) acryloyl group or (methyl) acryloxy; Therefore the SiH base can be end group, side group or these two; R 4Also can be to replace or unsubstituted C 1-20Alkyl for example comprises C 1-20Alkyl, alkenyl, aryl, alkoxyl, alkenyl oxy, aryloxy group, (methyl) acryloyl group or (methyl) acryloxy are alkyl, for example methyl on interior alkyl and required ground; X is integer 10-1000; With y be integer 1-20.Required ground, R 2And R 3Be not hydrogen, for example R simultaneously 1Be H, and R 2Or R 3Once be not all to be H.Required ground, the R base of non-H is a methyl.The amount of silane crosslinking agent should be enough to realize that the crosslinked of aequum and required ground consumption are that about 0.5-of composition weight is about 40%, is about 1-about 20% of composition weight more requiredly.
[0076] useful platinum catalyst comprises the complex compound of platinum or platiniferous, for example at the platinum hydrocarbon complex described in United States Patent(USP) Nos. 3159601 and 3159662; At the platinum alkoxide catalysis described in the U.S. Patent No. 3220972 with at the platinum complex described in the U.S. Patent No. 3814730 with at the platinum chloride-alkene complex described in the U.S. Patent No. 3516946.All these patents relate to the catalyst of platinum or platiniferous, specially are introduced into by reference at this.Required ground, the complex compound of platinum or platiniferous is dicarbapentaborane platinum loop vinyl complex compound, cyclic vinyl platinum complex, divinyl platinum complex or its bond.The consumption of platinum catalyst can be enough to make said composition being less than or equal under about 130 ℃ temperature, is being less than or equal under about 100 ℃ temperature requiredly, solidifies being less than or equal under about 90 ℃ temperature more requiredly.
[0077] in another aspect of this invention in, liquid gasket forms acrylate, carbamate, polyethers, polyolefin, the polyester that material can comprise actinic radiation curable, its copolymer and bond thereof.Required ground, curable material comprise the material of (methyl) acryloyl group end-blocking of (methyl) acryloyl group side group that has at least two.Required ground, (methyl) acryloyl group side group general formula :-OC (O) C (R 1)=CH 2Expression, wherein R 1Be hydrogen or methyl.More required ground, it is the polyacrylate of (methyl) acryloyl group end-blocking that liquid gasket forms material.The molecular weight of the polyacrylate of (methyl) acryloyl group end-blocking requiredly can be that about 3000-is about 40,000, is about 8000-about 15,000 more requiredly.In addition, the viscosity of the polyacrylate of (methyl) acryloyl group end-blocking under 25 ℃ (77) requiredly can be 800 handkerchief seconds (800 of about 200 handkerchiefs second (200,000 centipoise)-Yue; 000 centipoise); be about 450 handkerchiefs second (450,000 centipoise)-Yue 500 handkerchiefs second (500,000 centipoise) more requiredly.Can in people's such as Nakagawa european patent application No.EP1059308A1, find the details of material of this curable (methyl) acryloyl group end-blocking and commercially available in the Kaneka of Japan Corporation company.
[0077] requiredly, fluid composition comprises light trigger.Can use many light triggers herein, above-mentioned advantage of the present invention and advantage are provided.When photo curable composition is exposed to electromagnetic radiation as a whole, for example actinic radiation following time, light trigger improves the rapidity of curing process.The example of suitable light trigger as used herein comprises, but be not limited to, be available commercially from the light trigger of Ciba SpecialtyChemicals company with trade name " IRGACURE " and " DAROCUR ", particularly, " IRGACURE " 184 (1-hydroxycyclohexylphenylketone), 907 (2-methyl isophthalic acids-[4-(methyl mercapto) phenyl]-2-morpholinyl third 1-ketone), 369 (2-benzyl-2-N, N-dimethylamino-1-(4-morpholinyl phenyl)-1-butanone), 500 (bonds of 1-hydroxycyclohexylphenylketone and benzophenone), 651 (2,2-dimethoxy-2-phenyl acetophenone), 1700 (two (2,6-dimethoxy benzoyl-2,4, the 4-tri-methyl-amyl) bond of phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-third-1-ketone), with 819[two (2,4, the 6-trimethylbenzoyl) phenyl phosphine oxide] and " DAROCUR " 1173 (2-hydroxy-2-methyl-1-phenyl-1-third-1-ketone) and 4265 (2,4, the bond of 6-trimethylbenzoyl diphenyl phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-third-1-ketone); And ultraviolet light [blueness] light trigger, d1-camphorquinone and " IRGACURE " 784DC.Certainly, also can use the bond of these materials herein.
[0079] other useful herein light triggers comprise pyruvic acid alkane ester, for example the methyl esters of pyruvic acid, ethyl ester, propyl ester and butyl ester and pyruvic acid aromatic ester, for example pyruvic acid phenyl ester, benzyl ester and its suitable substitutive derivative.Especially the light trigger that is very suitable for herein using comprises ultraviolet initiator; for example 2; the 2-dimethoxy-2-phenyl acetophenone (for example; " IRGACURE " 651); with the 2-hydroxy-2-methyl-the 1-phenyl-1-propane (for example; " DAROCUR " 1173), two (2,4; the 6-trimethylbenzoyl) phenyl phosphine oxide (for example; " IRGACURE " 819) and two (2,6-dimethoxy benzoyl-2; 4; the 4-tri-methyl-amyl) two (η of the bond of the ultraviolet initator of phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-third-1-ketone (for example, " IRGACURE " 1700), and visible light initiator 5-2,4-cyclopentadiene-1-yl)-two [2,6-two fluoro-3-(1H-pyrroles-1-yl) phenyl] titanium (for example, " IRGACURE " 784DC).Useful actinic radiation comprises ultraviolet light, visible light and their combination.Required ground, the wavelength that the solidified liquid packing ring forms the employed actinic radiation of material is about 200 nanometers-Yue 1000 nanometers.Useful ultraviolet light includes, but not limited to ultraviolet light A (about 320 nanometers-Yue 410 nanometers), ultraviolet light B (about 290 nanometers-Yue 320 nanometers), ultraviolet light C (about 220 nanometers-Yue 290 nanometers) and bond thereof.Useful visible light includes, but not limited to blue light, green glow and bond thereof.This useful wavelength of visible light is about 450 nanometers-Yue 550 nanometers.
[0080] randomly, can before introducing fluid composition, release agent be applied in the die cavity 54.The packing ring of the auxiliary easy taking-up curing from die cavity of release agent optionally.Useful mold release compositions includes, but not limited to do spray, for example polytetrafluoroethylene and spraying oil (spray-on-oils) or trowelling oil (wipe-on-oils), for example silicone oil or organic oil.Useful mold release compositions includes, but not limited to be contained at least one end group place organic hydrophilic group, for example betaine, hydroxyl, carboxyl, ammonium salt base and the C that replaces in conjunction with end group thereof 6-C 14The composition of all-fluoroalkyl compound, this compound and metal surface chemistry and/or physical reactions.Can obtain various release agents, for example with commercially available those of trade name Henkel ' s Frekote.In addition, release agent can be the thermoplastic film that forms in mold shape.

Claims (26)

1. form the method for fuel cell, this method comprises:
The membrane electrode assembly that contains gas diffusion layers is provided;
Mould with die cavity is provided;
Jig is so that die cavity is communicated with the membrane electrode assembly fluid;
Apply curable fluid sealant composition in die cavity;
With the curing said composition.
2. the process of claim 1 wherein that the step that applies sealant further comprises:
Apply pressure on the sealant, so that the sealant penetration gas diffusion layers.
3. the process of claim 1 wherein that the step that applies sealant further comprises:
Apply sealant, so that membrane electrode assembly covers for sealed dose fully.
4. the process of claim 1 wherein that the step of hardening composition comprises:
Be less than or equal to thermal cure sealants under about 130 ℃ temperature.
5. the process of claim 1 wherein that the step of hardening composition comprises:
Be less than or equal to thermal cure sealants under about 100 ℃ temperature.
6. the process of claim 1 wherein that the step of hardening composition comprises:
Be less than or equal to thermal cure sealants under about 90 ℃ temperature.
7. the process of claim 1 wherein that the step of hardening composition comprises:
Curing sealant under room temperature roughly.
8. the process of claim 1 wherein that the step of hardening composition comprises:
Provide actinic radiation, curing sealant under room temperature roughly.
9. the process of claim 1 wherein that curable encapsulant composition comprises:
The hydrocarbon oligomer of alkenyl end-blocking;
Polyfunctional alkenyl monomer;
Has silicyl curing agent at least about two silicon hydride functional; With
Hydrosilylation catalysts.
10. the method for claim 9, wherein the hydrocarbon oligomer of alkenyl end-blocking comprises the polyisobutylene oligomer of alkenyl end-blocking.
11. the process of claim 1 wherein that this curable encapsulant composition comprises the material of actinic radiation curable, described material is selected from acrylate, carbamate, polyethers, polyolefin, polyester, its copolymer and bond thereof.
12. form the system of fuel cell, this system comprises:
First and second mold components with relative match surface, wherein at least one match surface have the die cavity of washer-shaped and the port that is communicated with this die cavity fluid and wherein at least one mold component transmission pass wherein actinic radiation; With
Actinic radiation sources is wherein when relative match surface is arranged with the relation of adjoining basically, by the actinic radiation transmissive die cavity of its generation.
13. the system of claim 12, wherein one of mold component comprises the fuel cell component that the packing ring of original place curing can form thereon, so that an integral gasket thereon to be provided.
14. the system of claim 13, wherein fuel cell component is a membrane electrode assembly.
15. the system of claim 14, wherein fuel cell component can by fixedly place between first and second mold components and further wherein die cavity be communicated with the fuel cell component fluid.
16. the system of claim 15, wherein fuel cell component is a membrane electrode assembly.
17. form the system of fuel cell, this system comprises:
First and second mold components with relative match surface, wherein at least one match surface has the die cavity of washer-shaped and the port that is communicated with this die cavity fluid, wherein at least one mold component can heat, when arranging with the relation of adjoining basically with the relative match surface of box lunch, this die cavity of heat energy transmissive.
18. the system of claim 17, wherein one of mold component comprises the fuel cell component that the packing ring of original place curing can form thereon, so that an integral gasket thereon to be provided.
19. the system of claim 18, wherein fuel cell component is a membrane electrode assembly.
20. the system of claim 17, wherein fuel cell component can by fixedly place between first and second mold components and further wherein die cavity be communicated with the fuel cell component fluid.
21. the system of claim 20, wherein fuel cell component is a membrane electrode assembly.
22. have the membrane electrode assembly that the encapsulant composition of curing places assembly peripheral part, wherein the encapsulant composition of this curing comprises:
The diallyl polyisobutylene oligomer of alkenyl end-blocking;
Have silicyl curing agent, wherein be bonded on the silicon atom about only a hydrogen atom at least about two silicon hydride functional; With
Hydrosilylation catalysts.
23. the membrane electrode assembly of claim 22, wherein cured compositions further comprises the polyfunctional group alkenyl monomer.
24. have the membrane electrode assembly that the encapsulant composition of curing places assembly peripheral part, wherein the encapsulant composition of this curing comprises the actinic radiation curable material, described material is selected from acrylate, carbamate, polyethers, polyolefin, polyester, its copolymer and bond thereof.
24. form the method for fuel cell, this method comprises:
Fuel cell component is provided;
Mould with die cavity is provided;
Jig is so that die cavity is communicated with the battery component fluid;
Apply curable fluid sealant composition in die cavity; With
Solidify said composition.
25. the method for claim 24, wherein fuel cell component is selected from cathode flow field plate, anode flow field board, resinous framework, gas diffusion layers, anode catalyst layer, cathode catalyst layer, film electrolyte, membrane electrode assembly framework, and bond.
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